I've just been re-reading this thread and have got myself slightly confused, why are you converting a flash for IR? Without the mod the flash will output IR and visable light and the filter on your camera will block the viable light leaving only IR to be recorded by the camera. I'm struggling to see the advantage of adding an IR filter to the flash, but that's probably just me being slow.
As an aside I decided to order a screw in IR filter to give it a proper go, they are relatively inexpensive so will give me a way to try it out before spending out on a conversion.
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